186 



CCELENTERA TA. 



[DIP. 



caduceus, Salter, 1853, (Graptolithus 

 caduceus,) Quar. Jour. Geo. Soc, vol. 

 9, p. 87, Quebec Gr. 



Fig. 169.— DIdymograptus geminus. 



geminus, Hisinger, 1840, (Prionotus gemi- 

 nus,) Leth Suecia, Supp. 2, p. 5, pi. 38, 

 Quebec Gr. 

 Diphyphyllum, Lonsdale, 1845, Russ. and 

 Ural Mts., vol. 1, p. 624. [Ety. diphyia, 

 division ; phyllon, leaf.] Corallum sim- 

 ple, composite, increasing by lateral 

 gemmation; corallites tall, cylindrical, 

 connected by epithecal or radiciform 

 expansions, with each other; central 

 area occupied by tabulae; circumscribed 

 by an inner wall ; exterior vesicular 

 zone occupied by septa, which are con- 

 fined between the outer and inner 

 mural investment; no columella. Type 

 D. conicum. 



adnatum. Hall, 1882, Fobs. Corals Niagara 

 and Up. Held Grs., p. 54, and 12th 

 Rep. Geo. Sur. Ind., p. 303, Up. 

 Held. Gr. 



apertum, Hall, 1882, Foes. Corals Niagara 

 and Up. Held. Grs., p. 54, and 12th 

 Rep. Geo. Sur. Ind., p. 303, Up. 

 Held. Gr. 



archiaci, see Crepidophyllum archiat-i. 



arundinaceum, Billings, 1859, Can. Jour., 

 vol. 4, p. 134, Corniferous limestone. 



breve, Hall, 1882, Foss. Corals Niagara 

 and Up. Held. Grs., p, 55, and 35th 

 Rep. N. Y. St. Mus. Nat. Hist., p. 459, 

 Up. Held. Gr. 



caespitosum, Hall, 1852, (Diplophyllum 

 caespitosum,) Pal. N. Y., vol. 2, p. 116, 

 Niagara (Jr. 



coralliferum, Hall, 1852, (Diplophyllum 

 coralliferum,) Pal. N. Y., vol. 2, p. 322, 

 Coralline limestone. 



cylindraceum, Hall, 1882, Foss. Corals 

 Niagara and Up. Held. Grs., p. 54, and 

 35th Rep. N. Y. St. Mus. Nat. Hist., p 

 458, Up. Held. Gr. 



fasciculum, Meek, 1877, U. S. Geo. Sur 

 40th Parallel, vol. 4, p. 29, Devonian. 



gigas, Rominger, 1876, Foss. Corals, p 

 125, Niagara Gr. 



gracile, McCoy, 1854, Brit. Pal. Foss., p 

 88, Up. Held Gr. 



huronicum, Rominger, 1876, Foss. Corals 

 p. 121, Niagara Gr. 



rectiseptatum, Rominger, 1876, Foss 

 Corals, p. 124, Ham. Gr. 



rugosum, Edwards & Haime, 1851, (Eri- 

 dophyllum rugosum,) Pol. Foss. des 

 Terr. Pal., p. 424, Niagara Gr. 



simcoense, Billings, 1859, (Eridophyllum 

 simcoense,) Can. Jour., vol. 4, p. 131, 

 Up. Held. Gr. 



stramineum, Billings, 1859, Can. Jour., 

 vol. 4, p. 135, Corniferous Gr. 



strictum, Edwards & Haime, 1851, (Eri- 



dophyllum strictum.i Poll. Foss. des 

 Terr. Pal., p. 424, l'|.. Held. Or. 

 tumidulum, Hall, 1882, Foss. Corals Ni- 

 agara and Up. Held. Grs., \>. 56, and 

 12th Rep. Geo. Sur. Ind., p. 303, Up. 

 Held. Gr. 



FlO. 170.— Dlpiiypliylluiii striiiiiliu-u in . 



vennori, Billings, 18*55, (Eridophyllum 

 vennori,) Can. Nat. and Geo., 2d ser., 

 vol. 2, p. 481, Clinton Cr. 



verneuilanum, Edwards A: Haime, 1850, 

 (Eridophyllum verneuilanum,) Brit. 

 Foss. Corals, p. lxxi, and Pol. Foss. des 

 Terr. Pal., p. 424, Up. Held Or. 

 Diplograptus, McCoy, 1854, (Diplograpsus,) 

 Brit. Pal. Rocks, p. 3. [Ety. djplooi, 

 duplex; grapho, I write.) Stipes 

 simple, flattened, or quadrangular; 

 cellules, in single series, on the two 

 sides of a double central axis ; cellules 

 oblique, opening toward the apex ; cell 

 denticles prominent, often mucronate. 

 Type D. foliaceus. 



amplexicaulis, Hall, 1847, (Graptolithus 

 amplexicaulis,) Pal. N. Y., vol. 1, p. 

 79, Trenton Gr. 



angustifolius, Hall, 1859, (Graptolithus 

 angustifolius,) Pal. N. Y., vol. 3, p. 

 515, Hud. Riv. Gr. 



ciliatus, Emmons, 1856, Am. Geo., p. 105, 

 Up. Taconic. 



dissimilaris, Emmons, 1856, Am. Geo., p. # 

 105, Up. Taconic. 



foliaceous, (?) Murch, 1839, (Graptolites 

 foliaceus,) Murch. Sil. Syst., p. 695, 

 Hud. Riv. Gr. 



